| // { dg-do compile { target c++17 } } |
| |
| #include <version> |
| |
| #ifndef __cpp_lib_optional |
| # error "Feature test macro for optional is missing in <version>" |
| #elif __cplusplus == 201703L && __cpp_lib_optional != 201606L |
| # error "Feature test macro for optional has wrong value for C++17 in <version>" |
| #elif __cplusplus == 202002L && __cpp_lib_optional != 202106L |
| # error "Feature test macro for optional has wrong value for C++20 in <version>" |
| #elif __cplusplus > 202002L && __cpp_lib_optional != 202110L |
| # error "Feature test macro for optional has wrong value for C++23 in <version>" |
| #endif |
